// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
 **************************************************************************
 * Copyright (C) 2008-2014, Google, International Business Machines
 * Corporation and others. All Rights Reserved.
 **************************************************************************
 */
package com.ibm.icu.util;

import java.io.InvalidObjectException;
import java.io.ObjectStreamException;

/**
 * Measurement unit for time units.
 *
 * @see TimeUnitAmount
 * @see TimeUnit
 * @author markdavis
 * @stable ICU 4.0
 */
public class TimeUnit extends MeasureUnit {
    private static final long serialVersionUID = -2839973855554750484L;

    /** Here for serialization backward compatibility only. */
    private final int index;

    TimeUnit(String type, String code) {
        super(type, code);
        index = 0;
    }

    /**
     * @return the available values
     * @stable ICU 4.0
     */
    public static TimeUnit[] values() {
        return new TimeUnit[] {SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, YEAR};
    }

    private Object writeReplace() throws ObjectStreamException {
        return new MeasureUnitProxy(type, subType);
    }

    // For backward compatibility only
    private Object readResolve() throws ObjectStreamException {
        // The old index field used to uniquely identify the time unit.
        switch (index) {
            case 6:
                return SECOND;
            case 5:
                return MINUTE;
            case 4:
                return HOUR;
            case 3:
                return DAY;
            case 2:
                return WEEK;
            case 1:
                return MONTH;
            case 0:
                return YEAR;
            default:
                throw new InvalidObjectException("Bad index: " + index);
        }
    }
}
